javax.faces.FacesException: core.apexpages.exceptions.ApexPagesDeveloperException:

Error as :

javax.faces.FacesException: core.apexpages.exceptions.ApexPagesDeveloperException: Map key BXRC-25E4000-F-04 not found in map

In a table i would like to display the data for the previous and current year.

This is the Table (expected output):

ProductName         Year       Q1       Q2   Q3    Q4       Total
 BXRC-25e4000-F-04  2014       100     200   300   400       1000 
                    2015       100                            100  
 BXRC-25e4000-F-23  2014       200                 200        400
                    2015       300                            300
 Subtotal ------------         700     200   300   600       1800

But i get the o/p as:

ProductName         Year       Q1       Q2   Q3    Q4       Total
 BXRC-25e4000-F-04  2014       500     200   300   400       1400 
 BXRC-25e4000-F-23  2014       200                 200        400
Subtotal ------------          700     200   300   600       1800

When i use the condition,i get the previous year data

if ((monthText == 'Jan' || monthText == 'Feb' || monthText == 'Mar')&&(year==previousyear))

But when i use the condition for the current year ,it does not works ,throws an error.

if ((monthText == 'Jan' || monthText == 'Feb' || monthText == 'Mar')&&(year==previousyear ||year==currentyear))

or

if ((monthText == 'Jan' || monthText == 'Feb' || monthText == 'Mar')&&(year==currentyear))

Any help very much appreciated